A flow through extraction reactor was used to study supercritical fraction-ation of butterfat. the rate of extraction of butterfat was constant for an initial period followed by a decreasing rate of extraction. DSC and GC analyses showed that more soluble triglycerides extracted preferentially in the initial stages exhibited lower melting behavior. the chemical and physical properties of the fractions changed with extraction time. Residual butterfat concentration in the bed was obtained as a function of distance from the bed entrance. the breakthrough curves had a sigmoidal shape, with the ascent-portion of the curves advancing through the bed with the degree of extraction. At the highest extents of extraction, the lower acyl carbon number triglycerides were totally depleted from the lowest portions of the bed, where fresh CO2 was introduced.
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Yoon et al. (1993) studied this question.
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